194991035374813 has 2 divisors, whose sum is σ = 194991035374814. Its totient is φ = 194991035374812.

The previous prime is 194991035374787. The next prime is 194991035374831. The reversal of 194991035374813 is 318473530199491.

Together with next prime (194991035374831) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156821596802649 + 38169438572164 = 12522843^2 + 6178142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194991035374813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194991035374843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97495517687406 + 97495517687407.

It is an arithmetic number, because the mean of its divisors is an integer number (97495517687407).

Almost surely, 2^{194991035374813} is an apocalyptic number.

It is an amenable number.

194991035374813 is a deficient number, since it is larger than the sum of its proper divisors (1).

194991035374813 is an equidigital number, since it uses as much as digits as its factorization.

194991035374813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88179840, while the sum is 67.

The spelling of 194991035374813 in words is "one hundred ninety-four trillion, nine hundred ninety-one billion, thirty-five million, three hundred seventy-four thousand, eight hundred thirteen".